LeetCode:Excel Sheet Column Title

问题描述：

Given a positive integer, return its corresponding column title as appear in an Excel sheet.

For example:

1 -> A
2 -> B
3 -> C
...
26 -> Z
27 -> AA
28 -> AB

思路：将十进制转变成26进制

代码：

class Solution {
public:
string convertToTitle(int n) {
if(n < 1) return "";
else{
int cnt = 0;
string  intToString ="";
while(n != 0){
intToString = char((n - 1) % 26 + 'A') + intToString;
n = (n - 1) / 26;
}
return intToString;
}
}
};